The FAB Defense FBS is a compact front back-up sight designed for AR-15/M4/M16 platforms. It offers a low folded profile and an ergonomic shroud to aid sight alignment. Deployment uses an instant spring-locked mechanism and elevation is adjustable without tools. Constructed of high-grade polymer and metal, the FBS is intended for reliable service on duty rigs, range setups, or field use.
Key Specifications
- Can be used as a primary or back-up sight.
- Designed with an ergonomic angel-wing-shaped front shroud to help center the image.
- Provides a low folded profile that resists snagging on gear or brush.
- Features an instant spring-locked deployment mechanism that will not slip, break, or deform.
- Offers tool-free, rapid elevation adjustments with positive detent locking.
- Mounts on any 1913 Picatinny rail.
- Constructed from high-grade polymer and metal.
- Fits AR-15 / M4 / M16 platforms.
- Style is Flip Up Back Up.
- Weight is listed as 0.16.
Compact, durable, and simple to operate, the FBS gives shooters a practical sighting option that blends unobtrusive carry with positive, repeatable deployment. Its combination of tool-free adjustment, rugged materials, and Picatinny compatibility makes it suited for shooters seeking a dependable front sight for range, duty, or field applications.
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